I had a 72 Chevelle and a 72 Elcamino, I do not know why there is a difference but I went through that probably 15+ years ago. If I remember right, and most likely I don't, the Elcamino and the Chevelle used different, but looked the same, lenses. Or maybe it was the fender extensions?

Yes, I found after buying the '72 that the only things in common between the Chevelle and El Camino front ends are the hood, grille, and bumper. Fenders, fender extensions, bezels, lenses are all different.

the difference may be placement of the signal/park system with regard to the beam Flood of the headlight system..a white flashing lamp under a high-beam is impossible to see at night..whereas a yellow is not..

The other guess, would be, some worry~wort engineer at DOT thought white Vs Yellow to the front provides better lumen's and ordered a change mid year..

My third guess is : That is why it is Called "General Mystery"... (if it ain't broke...engineer it so it soon will require service at the dealer..)

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